\n\n\n\n\n\n The return Statement
\nslide5. 5 In JavaScript we have the following conditional statements:\n\nif statement - use this statement to execute some code only if a specified condition is true\n\nif...else statement - use this statement to execute some code if the condition is true and another code if the condition is false\n\nif...else if....else statement - use this statement to select one of many blocks of code to be executed\n\nswitch statement - use this statement to select one of many blocks of code to be executed\n\nNote that if is written in lowercase letters. Using uppercase letters (IF) will generate a JavaScript error! Conditional Statements
\nslide6. 1. if Statement\nSyntax if (condition)\n{\ncode to be executed if condition is true\n}\n\nExample:\n\nHello World\n\n\n 6
\nslide7. 7 2. If else Statement •Use the if....else statement to execute some code if a condition is true and another code if the condition is not true.\n\nSyntax\nif (condition)\n{\ncode to be executed if condition is true\n}\nelse\n{\ncode to be executed if condition is not true\n}
\nslide8. 8 If..else Statement–Example
\nslide9. 9 3. If…else if…else Statement •Use the if....else if...else statement to select one of several blocks of code to be executed. Syntax\nif (condition1)\n{\ncode to be executed if condition1 is true\n}\nelse if (condition2)\n{\ncode to be executed if condition1 is false and condition2 is true\n}\nelse\n{\ncode to be executed if neither condition1 nor condition2 is true\n}
\nslide10. 10 If…else if…else Statement– Example
\nslide11. 11 4. Switch Statement Use the switch statement to select one of many blocks of code to be executed.\n\nSyntax\nswitch(n)\n{\ncase 1:\nexecute code block 1 break;\ncase 2:\nexecute code block 2 break;\ndefault:\ncode to be executed if n is different from case 1 and 2\n}
\nslide12. 12 Switch Statement–Example
\nslide13. 13 Loops execute a block of code a specified number of times, or while a specified condition is true.\n\nThe for loop has the following syntax:\n\n\nfor (statement 1; statement 2; statement 3) { code block to be executed\n} For loop
\nslide14. 14 Loop through the six different HTML Headings.\n\n\n\n\n\n\n\n For Loop–Example
\nslide15. 15 While Loop Syntax\nwhile (condition)\n{\ncode to be executed\n}\nExample:\n\n\n

Introduction to Web Programming Lecture 9:

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Introduction to Web Programming Lecture 9: Introduction to JavaScript (Part 2) 1 Natheer Gharaibeh 2 Outlines of todays lecture Functions Conditional statements Loops Popup windows Events 3 A JavaScript function is a block of

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01
Introduction to Web Programming Lecture 9: Introduction to JavaScript (Part 2) 1 Natheer Gharaibeh<br>
02
2 Outlines of today’s lecture • Functions • Conditional statements • Loops • Popup windows • Events<br>
03
3 • A JavaScript function is a block of code designed to perform a particular task.
A function will be executed by an event or by a call to the function.
JavaScript Function Syntax
A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().
Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).
The parentheses may include parameter names separated by commas: (parameter1, parameter2, …)
The code to be executed, by the function, is placed inside curly brackets: {} functionName(parameter1, parameter2, parameter3)
{
code to be executed
} JavaScript Functions<br>